Captcha will eliminate spam bots as we all know they cant read. But I do agree with Sammie on most people use auto complete cuz plain and simple .. their lazy lol including myself when it comes to typing in junk. :o)~
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And after messing around with this more this morning (using FF) im finding that the only fields that are required are the name and email fields .. and of course entering the captcha. Nothing else and it sends through. In the latest (not sure about previous versions) FF is see more pretty much telling me this? Those field blocks are yellow. In order for me to submit the form I had to (using auto complete) Enter my name, then email (still no submit button) tab to name field then back to email field then the button was usable? ack! Not very user friendly if you ask me. But secure!?! My guess the average user will just move on and say "oh well, its broken" ...

So maybe this is a big deal .. hmmm

I think for now i will just edit the language file (or whatever, wherever) stating what Sammie suggested ... Please TYPE in your Name and Email.

Basically some sort of instructions for the end user.